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Down load here my article pdf file (for personal use only)
 

       


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CLICK BELOW - ON COVER - TO ENTER THE PROJECT RESOURCES INFOS, PHOTOS AND MORE


QEX first Cover about my article published in March-April 2003 issue.
 Title: A High-Level Accessory Front End for the HF Amateur Bands (pages 45 to 56)
 (with ARRL permission and copyright by Sergio Cartoceti, IK4AUY, 2003. This material originally appeared  in
QEX: Forum for Communications Experimenters)
if you are a licensed  amateur radio and you are  interested to get a copy
  you can download from this page a .pdf  file (about 1 Mb) or ask for a copy to ARRL-QEX Editor-
 for personal use and amateur radio  interest only.

 

The above  push-pull  preamplifier schematic  alone has been included 
by  John Delvoldere, ON4UN
in Low - Band DXing    (Fourth Edition)  by ARRL
ISBN: 0-87259-914-0
ERRATA CORRIGE: in this schematic there is a printing error
the emitter resistor to ground in each 2N5109 should be 100 Ohm
(not the wrong value shown of 560 Ohm)
My QEX article is correct.
The text article in the book at page 7-98 and 7-99 is indeed 100%
correct so with 100 Ohm emitter resistor  each transistor is biased
for about 50 to 60 mA  (so for 2 X 2N5109  a total current of
around 100 mA at 12V DC or about  115mA at 13.8VDC.

 

For E-MAIL to me:
ik4auy*(NOSPAM)*@arrl.net
 or
 ik4auy*(NOSPAM)*@qsl.net
 CCorrect e-mail is without  *(NOSPAM)*

 

Link to QEX (ARRL) page
 "forum for Communications Experimenters"

Last update: Nov  22,  2009